Dental syringe



April A. F. PIEPER 20,704 v DENTAL SIRINGE Original Filed May 8, 1956 2Sheets-Sheet 1 Nil" iii lN vENTOR.

' z:s ATTORNEYS Reissued Apr. 19, 1938 UNITED STATES PATENT OFFICE No.78,603, May 8, 1936.

Application for reissue October 13, 1937, Serial No. 168,834

28 Claims.

The present invention relates to a fluid control device such, forexample, as a dental syringe, and has for its object to provide in adevice of this class a simplified construction embodying relatively fewparts which can be conveniently assembled and operated.

A further object of the invention is to provide an improved arrangementof parts within the body of the syringe for effectively heating andcontrolling the fluid or liquid therein.

A further object of the invention is to provide improved means forheating an initial supply of liquid within the syringe on either or bothsides of the valve for controlling the liquid outlet, whereby to providefor the instant flow of preheated liquid from the nozzle at the desiredtemperature upon opening the valve.

A further object of the invention is to provide in a syringe of thisclass a plurality of unitary detachably associated fluid heating andcontrol sections which can be readily assembled or detached one fromanother, and which will be dependable and efliclent in service.

A further object of the invention is to provide in combination with a.dental syringe having a conduit connected with a liquid supply unit forsupplying warm or cold liquid to the syringe, improved heating meanswithin the syringe for maintaining the liquid therein at a predeterminedtemperature ready ior use upon opening the valve for controlling theflow of the liquid.

To these and other ends the invention resides in certain improvementsand. combinations of parts, all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings:

Fig. 1 is a view in elevation of a fluid temperature control deviceembodying the invention;

Fig. 2 is a longitudinal section through the syringe shown in Fig. 1.

Fig. 3 is a fragmentary longitudinal section through the body of thesyringe drawn to an enlarged scale and showing the arrangement of thefluid control valve and heating coil;

Fig. 4 is a horizontal section on line 4-4 of Fig. 3, and

Fig. 5 is a side view of the unitary valve and heating coil sectionshown in Fig. 3, but drawn to a. reduced scale.

The same reference numerals throughout the several views indicate thesame parts.

Referring to the drawings, the syring comprises a pair of inner andouter tubular body sections l0 and II respectively, telescoped formovement one longitudinally of the other, the outer section having anozzle I2 thereon in communication therewith. The inner section IIIconstitutes the handle of the syringe to be gripped by the operator whenusing the syringe. A tubular section 5 I3 is detachably mounted withinthe handle or body section II) and has at its inner end an enlargedportion I3a closely fitting the bore of the handle, the enlarged portionhaving a reduced extension I4 carrying a reduced portion I5. Rigidlysecured within the outer end of the reduced portion I5 is a tubularextension I6 telescoped within the bore ll of the outer body section II.

A liquid-tight joint is formed between the tube I6 and the body sectionII by means of suitable packing I3 which is compressed and held inposition by a nut I9 threaded within the body section, as shown in Fig.2.

The tubular section I3 is detachably supported within the handle orinner body section Ill by 20 means of a thimble 2Il threaded within thebody section and shouldered at its outer end to receive the tubularsection I3. The reduced portion I4 of the inner tubular section forms avalve chamber 2I within which is mounted a suitable valve 22 having agradually tapered portion 23 extending within the bore of the reducedportion I5 of the tubular section I3, as shown in Figs. 2 and 3. Thevalve is normally held in closed position by a spring 24 within thechamber 2i, the spring being carried by a tubular support 25 formed ofsuitable insulating material and closely fitted within the enlargedportion I3a of the tubular section I 3. Screwed into the support is ametal contact 26 having its lower end recessed to receive the beveledend of a coupling 21, suitably connected with a flexible tube 28 forsupplying liquid to the valve chamber 2|, the tube being connected witha suitable source of liquid as described hereinafter.

The coupling 21 is extended through an outer coupling 29 which isthreadedly secured within the lower end of the enlarged portion I311 ofthe tubular section I 3 as shown in Figs. 2 and 3. The coupling 21 issupported within the outer coupling 29 by a connection 30 formed ofinsulating material which serves to clamp the gaskets 3| upon the innerwall of the outer coupling 29 to form a liquid-tight joint between theinner and outer couplings, as shown in Fig. 3. The inner coupling isfurther insulated from the outer coupling by means of a. sleeve 32formed of suitable insulating material.

The coupling 29 is reduced at its lower end to receive an outer flexibletube or conduit 33 containing the inner liquid supply tube 28 and thewires for supplying current to the heating coil, said tubes beingconnected with a suitable water supply unit, described hereinafter.

The outer conduit 33 is protected at its point of connection with thesyringe by a guard 35 preferably comprising a coiled spring suitablyconnected with the thimble 20 for supporting the tubular section I3within'the handlefor body .section I!) of the syringe.

The tapered or conical portion 23 of the valve has loosely insertedtherein an operating stem" 36 which extends through the outer tube IG ofthe tubular section I3 and into the bore or recess I! of the outer bodysection II, the latter having a fluid outlet passage communicating Withthe nozzle I2. stem has formed thereon an e'xterisioni'l slotted at 38and threaded to receive a screw 39, the head 48 of which engages a seat4| on the tubular section II. Byslotting the extension the opposite jawsthereof will yieldingly grip the screw to firmly hold it in adjustedposition. The screw is slotted at 42 for the reception of a suitabletool for turning it to vary the length of the valve stem whereby toregulate the position of the valve to accommodateit to its seat.

The slot 42 also serves as an outlet passage for the fluid admitted tothe bore I! of the tubular body member II.

To effect opening of the valve it is only necessary to move the tubularbody section I I inwardly on thehandle or body section III, which isdone by swinging the lever 43 toward the outer body section fromthenormal position shown in Fig. 2. Thelever is pivotally supported at44 on a band'45substantially surrounding the body section I0 andsuitably secured thereon. The lever has a laterally projecting part 45extending through an opening 46 inthe wall of the handle I I) and into arecess. 41 formed in the outer body section I I. The pro'jectingpart 45of the lever engages a shoulder 48 on. the outer body section wherebywhen the lever is moved toward said section it will operate to move itlongitudinally within the handle or-body member ID to effect opening ofthe valve.

The supply means from' which fluid or liquid is discharged-to the, innerflexible tube 28 may be of any well known type, such, for example, asthat shown by'U. S. Patent No. 1,911,386, com,- prising a liquid controlunit for supplying either hot or cold water to a dental syringe. Acorresponding unit is indicated generally at 49 in Fig. 1 and comprisesa, reservoir having liquid inlet connections, not shown, and acommunicating valve housing 50 having a discharge valve, not shown,provided .with an operating arm 5| forked at its outer end to receivethe reduced portion Ila of the tubularrbody section II of the syringefor supporting the syringe in a substantially vertical position when notin use, in which position the syringe serves to hold the valve in thehousing 50 closed.

The housing has, an extension 52 provided with a suitable connection 53for supporting an insulating coupling 54 carrying the flexible tube 33,the fluid supply tube 28 therein and the circuit wires 55 and 56disposed within the outer tube but exteriorly of the supply tube. Theinner ends of the Wires are shown in Fig. 2, but their outer ends, notshown, are suitably connected with the binding posts or studs5'l carriedby the coupling 54. Secured to'the binding posts are the circuit wires58 and 58a whichv are connected The upper end of thelvalve with astep-down transformer 59, as shown in Fig. 1, the transformer beingpreferably connected with an ordinary lighting circuit, the voltage ofthe heating coil circuit being reduced to afford the desired heatingcapacity for the coil which is shown at 60 within the heating chamber BIof the syringe.

As shown in Fig. 2 the circuit wire 55 is connected with the innercoupling member 21 and the circuit'wire 56'with the outer couplingmember 29, the coupling members being insulated one from another; asshown, and as previously described.

Extending from one end of the heating coil is a short connection 62which in turn is connected with the metal contact 26 by a binding post63. The opposite end of the coil is connected at 64 with the reducedportion I5 of the inner tubular section I3, with which is connected thecoupling 29 and. upon which is secured the inner end of the circuit Wire56, Fig. 2.v Current for heating the coil will flow through wire 55,coupling 21, contact 26, and connection 62, returning through thetubular section I3 and the coupling 29 to wire 55.

The contact 26 is rendered accessible by providing an opening 65 in thewall of the tubular section. I3 so that the screw or binding post 63 canreadily be applied tosecure the circuit connection 62 to said'contact.The tubular section I3 is preferably slotted at 66 to receive a strip5'! of insulating material for holding the circuit connection 62 out ofcontact with the tubular section I3, as shown inFigs. 2,3, and 5.

The heating coil 60 is wound upon a suitable support 68 formed ofinsulating material such; for example, as porcelain, the support beingpref erably grooved as indicated at 63 to hold the coils in properspaced relation. The insulating support encircles the, reduced portionI5 of the tubular section I3 and is preferably held thereon by the useof 'an inwardly vdisposed'layer of ce ment or binding material 10. Theportion I5 of the tubular section is grooved at II to form annularpockets for receiving portions of the bindingmaterial whereby to bettersecure the coil supporting member upon the inner tubular section.

The heating chamber GI extends longitudinal- 1y of the tubular sectionI3, both inwardly and outwardly of the valve '22 and in surroundingrelation with respect to the inner and outer fluid holding portions I4and I5 of said section, so that the fluid or liquid therein will bemaintained at the desired temperature by the heat given off by the coil60. Thisapplies also to the liquid within the extension I6 of thetubular section and that within the lower portion of the section I3,which portions will also be heated since they form a continuation of theportions I4 and I5 surrounded by the heating chamber 6 I.

The heating chamber is formed in part by a metal sleeve I2 inserted uponthe tubular section I3 and closed at its outer end by a trans verse WallI3 recessed to receive the outer end of the sleeve and suitablyconnected therewith. The wall 13 rests upon the outer end of thereduced'portion .I5 of the tubular section and is recessed to receive agasket I4 for insuring a liquid-tight joint around the tubular extensionIS. A metaldisk'15 is placed upon the gasket to form a seat for theinner end of a spring 18 whic-hsurrounds the tube I6 and serves toyieldingly urge the inner endof the tubular section I3 against the, endof the thimble 2D, screwed a valve.

into. the handle or body In of the syringe, as shown in Fig. 2.

Means is provided for protecting the heating chamber 6| against undueloss of heat by radiation through the walls of the sleeve 12 and thehandle or casing II], this means preferably comprising a cylindricalelement 11 inserted within the sleeve and formed, of suitable-insulatingmaterial such, for example, as mica.

A stop collar 18 is threadedly disposed on the body section II foradjustment thereon to limit inward movement of the section throughengagement with the body or handle section III of the syringe whereby toregulate the extent of movement of the valve 22.

It will be understood that with the present syringe the fluid or liquidholding passage disposed outwardly of the valve 22 and formed by theportions I and iii of the tubular section I3 will remain substantiallyfilled with the liquid after the valve 22 has been closed. The liquidwithin said passage, indicated at 69 in Fig. 3, constitutes an initialsupply which will be quickly discharged through the nozzle upon openingthe It is obviously desirable that this initial charge of liquid bemaintained at the desired temperature and ready for instant use uponopening the valve and this is accomplished by placing the heating coil50 of the chamber GI in advance of the valve and in surrounding relationwith respect to the passage or chamber containing the liquid, as shownin Figs. 2 and 3. It is also desirable that the liquid within the valvechamber 21, indicated at 80, be heated so as to increase the supply tobe maintained at the desired temperature. To this end the heatingchamber 6| is extended below the valve in surrounding relation withrespect to the valve chamber and the liquid therein. With thisarrangement the walls of the inner tubular section extending inwardlyand outwardly of the valve will remain heated to maintain the liquid onopposite sides of the valve at the desired temperature and ready forinstant use when needed.

As previously stated, the syringe is formed of a plurality of unitarysections which can be quickly assembled or detached one from anotherwhen desired. For example, before applying the thimble 20 to the handleID, the inner tubular section l3 and associated parts may readily beinserted within the handle as a complete unit, which includes the tubeI3 and its extension Hi, the valve within the tube, the heating coil,and the casing surrounding the coil, these parts being likewisewithdrawable from the handle as a unit.

The walls of the portion I5 of the tubular member [3 which aresurrounded by the heating coil are made relatively thick to afford asubstantial mass or body of metal, acting as a heat reservoir to storeheat, and as a conductor for conducting heat from the heating element tothe liquid within the portion l5 and also, to a lesser extent, to thatwithin the portion I l. The heat stored in this mass of thick metalassists in rapidly heating up the incoming cooler liquid faster thanwould be the case if the heat reservoir were not provided. Thus apreheated supply of liquid at the desired temperature is maintainedready for instant use whenever required.

The conduit 33 and coupling 29 constitute another unit which may beattached to the section It, either before or after assembling it withinthe handle. Furthermore, the conduit and tubular section and itsassociated parts may be inserted within or withdrawn from the handle asa unit. Moreover, the outer body section II and nozzle l2 constitute anadditional unit detachably connected with the handle or body section l0and can be withdrawn therefrom upon removing the operating lever 43 fromthe handle.

The temperature of the heating coil 60, is continuously maintained, asdescribed, by connection with the lighting circuit. The flexible tube28, as shown, is of relatively small bore, to restrict the quantity ofwater contained in it at any one time, so that if cooled by standing inthe tube, the water may be readily brought up to temperature as it flowsthrough the heated tubular member l3 with its compactly arranged heatingcoil. Therefore, when the syringe has not been in use for a considerableperiod of time, or when only small quantities of water areintermittently discharged, so that the water tends to cool off in. thetube 28, the invention provides means located in the syringe body itselffor both maintaining the temperature of the water contained in thesyringe body and bringing up to the proper temperaturethe water flowingthrough the syringe from the tube 28, pending such increased use as willresult in the arrival at the syringe of warm water from the unit 49.

I claim:

1. A syringe comprising a tubular body, a fluid holding tubular memberextending longitudinally within the body, nozzle means for the fluidwithin said member movable longitudinally on the tubular body, a valvewithin the body'for controlling the fluid actuated by said nozzle meanswhen moving it in one direction on the tubular body, and heating meanswithin the body surrounding a portion of the tubular member there- 2. Asyringe comprising a tubular body, a fluid holding tubular memberextending longitudinally within the body, outlet means for the fluidwithin said member movable longitudinally on the tubular body, valvemeans within said tubular member adapted to be opened by moving theoutlet means in one direction on the body, a closed heating chamberwithin the tubular body between the outlet means and the valve means andsubstantially encircling the fluid holding tubular member, and anelectric heating element within said chamber for heating the fluid insaid tubular member.

3. A syringe comprising a tubular body, a fluid holding tubular memberextending longitudinally within the body, valve means within saidtubular member, a heating chamber within the tubular body in advance ofthe valve means, an electric heating element within said chamber, atubular section movable on said body to actuate the valve means, saidtubular section communicating with said tubular member, and a nozzle onsaid tubular section movable therewith when said section is moved toactuate the valve.

4. A syringe comprising a tubular body, a fluid holding tubular memberextending longitudinally within the body, a nozzle carrying membermovable on the tubular body, a normally closed valve within the tubularmember dividing it into inner and outer fluid holding passages, anoperating part for the valve extending longitudinally within said outerfluid holding passage and adapted to be actuated by the nozzle carryingmember upon moving it on the tubular body, a heating chamber for heatingthe walls of the tubular member, said chamber encircling a portion ofthe tubular member surrounding the outer fluid holding passage,

and an electric heating element. within said chamber.

'5. A syringe comprising a tubular body, a fluid holding tubular memberextending longitudinally within said body, a normally closed valvewithin the tubular member dividing it into inner and outer fluid holdingportions, an operating part for the valve extending longitudinallywithin said outer fluid holding portion, a heating chamber within saidbody for heating the walls of the tubular member surrounding said fluidholding portions and said valve, an electric heating coil Within saidchamber encircling said valve and said tubular member at a pointopposite one of said fluid holding portions, an actuating member movableon said body for moving said valve operating part to open the valve,said actuating member communicating with said tubular member, and anozzle carried by the actuating member.

6. A syringe comprising inner and outer tubular body sections, a nozzlecarried by the outer section, means operable to move the outer sectionlongitudinally of the inner section, said inner section including afluid holding tubular member extending within the outer section andcommunieating therewith, a valve within the tubular member between theends thereof having an operating part actuated by the outer'seetion whenmoving it in one direction upon the inner section, and an electricheating element within the inner body section for heating the fluidholding portion of the tubular member immediately in advance of thevalve.

7. A syringe comprising inner and outer tubular body sections movableone longitudinally of another, a nozzle on the outer section, a valvedisposed within the inner section between the ends thereof for'dividingsaid section into oppositely extending inner and outer fluid holdingportions, the valve being opened by movement of the outer sectionlongitudinally on the inner section, and an electric heating coil fixedon the inner section in advance of the valve and serving to heat a partof the fluid holding portion of the inner section.

8. A syringe comprising inner and outer tubu-' lar body sections movableone longitudinally of another, a nozzle on the outer section, a valvedisposed within the inner section between the ends thereof serving whenclosed to divide said section into-oppositely extending fluidholdingportions, the valve being opened by movement of one of the sectionslongitudinally of another in one direction, a heating chamber extendinglongitudinally of the inner body section and substantially encirclingthe oppositely extending fluid holding portions thereof, and an electricheating coil within said chamber.

9. A syringe comprising inner and outer tubular body sections mountedfor movement one longitudinally of another, a nozzle carried by theouter section, means operable to move one of the sections'longitudinallyof the other, said inner section including'a fluid holding tubularmember communicating with the outer section, a valve within the tubularmember between the ends thereof serving when closed to divide it intooppositely extending fluid holding portions, the valve having anoperating part by which it is moved to open position upon movement ofone of the sec tions longitudinally of the other in one direction, andan electric heater associated with the portion of the tubular memberdisposed outwardly of the valve for heating the fluid held in saidportion by the valve.

10. A syringecomprising inner and outer tubular body sections mountedfor movement one longitudinally of the other, a nozzle carried by theouter section, means operable to move one of the sections longitudinallyof the other, said inner section including a fluid holding tubularmember communicating with the outer section, a valve within the tubularmember between the ends,

thereof serving when closed to divide it into oppositely extending fluidholding portions, the valve having an operating part actuated by one ofthe body sections upon moving one longitudinally of another, a heatingchamber extending longitudinally of the tubular member and substantiallysurrounding said oppositely extending fluid holding portions to heat thefluid therein, and an electric heating element within said chamber.

11. A syringe comprising inner and outer tubular body sections movableone longitudinally of another, a nozzle carried by the outer section,said inner section including a handle for the syringe and having thereina fluid holding tubular member the outer end of which is telescopedwithin the outer body section, a valve within said tubular memberbetween the ends thereof serving when closed to divide said member intooppositely extending fluid holding portions, said valve being opened toestablish communication between said portions upon movement of one ofthe sections longitudinally of another, a heating chamber within thehandle extending longitudinally thereof and substantially surroundingthe oppositely extending fluid holding portions of said tubular member,and an electric heating coil surrounding one of said fluid holdingportions for supplying heat to said chamber to heat both of saidportions.

12. A syringe comprising inner and outer tubular body sections movableone longitudinally of another, a nozzle carried by the outer section,means operable to move the outer section longitudinally of the innersection, said inner section including a fluid holding tubular member communicating with the outer body section, a valve within the tubularmember serving when closed to divide it into oppositely extending fluidholding portions, said valve being opened by movement of one of the bodysections longitudinally of the other, a heating chamber extendinglongitudinally of said tubular member and encircling said oppositelyextending fluid holding portions, an electric heating coil surroundingone of said portions for supplying heat to said chamber for heating bothof said fluid holding portions, a fluid supply tube connected with saidtubular member, and circuit connections within said supply tube forsupplying current to said coil.

13. A syringe comprising inner and outer tubular body sections movableone longitudinally of another, said inner section having a valvethereinbetween its ends normally dividing the section into inner andouter fluid holding portions, means forming a closed heating chamberabout the inner end of said outer fluid holding portion, an electricheating element within said chamber, said valve being opened by movementof one of the body sections longitudinally of the other in onedirection, and means for moving said last mentioned section in saiddirection.

14. A syringe comprising a tubular handle, an outer tubular body sectionincluding a nozzle movable longitudinally on the handle, and a unitaryfluid holding tubular section within the handle having associated partsincluding a valve between the ends of said section for dividing it intoinner and'outer fluid holding portions and also including means forminga closed heating chamber about said outer fluid holding portion, and anelectric heating element within the chamber for heating said outer fluidholding portion, said fluid holding section and associated parts beingremovable from the handle as a unit and said valve being opened byinward movement of said body section upon the handle.

15. A syringe comprising a tubular handle, an outer tubular body sectionmovable longitudinally on the handle, a nozzle on said section movabletherewith, a unitary inner section mounted within the handle andincluding a fluid holding tube communicating with said tubular bodysection, said fluid holding tube having a valve intermediate its endsand having a surrounding electric heating coil in advance of the valve,said inner section and the valve and coil being withdrawable from thehandle as a unit, and a part for opening the valve extending within thetubular body section and operated by said section when moving itlongitudinally on the handle in one direction.

16. A syringe comprising a, tubular handle, an outer tubular bodysection movable longitudinally on the handle, a nozzle carried by saidsection, a unitary inner fluid holding section within the handle, avalve within the inner tubular section between the ends thereof normallydividing it into inner and outer fluid holding portions, an electricheating coil encircling one of said fluid holding portions for heatingthe fluid therein, said valve being opened by inward movement of thetubular body section upon the handle, said inner tubular fluid holdingsection and the valve and heating coil being removable from the handleas a unit, and detachable means on the handle for supporting the innertubular section therein.

17. A syringe comprising a tubular handle, an outer tubular body sectionmovable longitudinally on the handle, a nozzle carried by said section,a unitary inner fluid holding section within the handle, a valve withinthe fluid holding section between the ends thereof normally dividing thesection into inner and outer fluid holding portions, means within thehandle forming a closed heating chamber about the valve and the fluidholding portions at the opposite ends of the valves, an electric heatingelement within said chamber, said inner fluid holding section togetherwith the chamber forming means and the valve and heating coil beingWithdrawable from the handle as a unit, and means for moving the tubularbody section upon the handle to effect opening of the valve.

18. A syringe comprising inner and outer tubular body sections movableone longitudinally on another, a nozzle on said outer section, a valvewithin said inner section for controlling the flow of the liquid to thenozzle, an electric heating element within the inner body section forheating the liquid, and means for moving one of the body sectionslongitudinally on the other to effect opening of the valve.

19. A syringe comprising inner and outer tubular body sections movableone longitudinally on another, a nozzle on said outer section, a valvewithin said inner section for controlling the flow of the liquid to thenozzle, an electric heating element within the inner body sectiondisposed outwardly of the valve for heating theliquid remaining withinthe syringe in advance of the valve upon closing the latter, and meansfor moving one of the body sections longitudinally on the other toefiect opening of the Valve.

20. A syringe comprising inner and outer tubular body sections movableone longitudinally on another, said outer section having a nozzlethereon, a valve within the inner section for controlling the flow ofthe liquid to the nozzle, means forming a heating chamber extendinginwardly and outwardly of the valve, an electric heating element withinthe chamber for heating the liquid on opposite sides of the valve, andmeans for moving one of the body sections longitudinally of the other toeffect opening of the valve. 21. A syringe comprising a body, a nozzlecarrying member movable on said body, a tubular fluid holding memberwithin said body, said fluid holding member having a portion spaced fromsaid body to provide a heating chamber between said fluid holding memberand said body, a fluid control valve associated with said fluid holdingmember and adapted to be opened by movement of said nozzle carryingmember upon said body, and an electric heating element in said heatingchamber, said fluid holding member including a substantial body of metalto receive and retain heat from said heating element and to conduct heatto the fluid within said fluid holding member.

22. A syringe comprising a casing, a tubular fluid holding member withinsaid casing, at least a part of said fluid holding member being ofsmaller external size than the internal size of said casing to providean annular heating chamber between said member and said casing, anelectric heating coil in said chamber surrounding said portion of saidfluid holding member, the portion of said fluid holding member adjacentsaid electric heating coil including a body of metal of substantialthickness, a nozzle carrying member movable upon said casing and incommunication with a portion of said fluid holding member, and valvemeans for closing said fluid holding member adapted to be opened bymovement of said nozzle carrying member in one direction.

23. A syringe comprising a tubular body, a liquid holding tubular memberextending longitudinally within the body and normally filled withliquid, outlet means for the liquid movable on said tubular body, avalve within the tubular body between the ends of the tubular member forcontrolling the liquid, said valve being operated by movement of saidoutlet means in one direction, and heating means within the bodysubstantially surrounding the tubular member and adapted to heat theliquid therein.

24. A syringe comprising a tubular body, a liquid holding tubular memberextending longitudinally within the body and normally filled withliquid, outlet means for the liquid movable on said tubular body, avalve within the tubular body between the ends of the tubular memberadapted to control the liquid and to be opened by movement of the outletmeans in one direction on the tubular body, a heating chambersubstantially surrounding the tubular member and extending forwardly andrearwardly of the valve, and electric heating means within said chamber.

25. A syringe comprising a tubular body, a liquid holding tubular memberextending longitudinally within the body, a valve within said tubularmember for controlling the fluid, a nozzle movable on the tubular bodyto effect opening of the valve, means for moving the nozzle, meanssubstantially surrounding the tubular member within said tubular bodyand i'orming a heating chamber for heating the liquid within the tubularmember, .said chamber extending longitudinally on opposite sides of thevalve, and heating means within said chamber.

26. A syringe comprising a tubular body, an outer tubular body sectionincluding a nozzle movable longitudinally on said tubular body, a fluidholding tubular member extending longitudinally within said body andhaving an extension projecting within said outer body section, a valvefor controlling the passage of the fluid through the tubular memberhaving an operating part adapted to be actuated by the outer bodysection to open the valve upon moving said body section in one directionon the tubular body, and electric heating means within the tubular bodysubstantially surrounding the fluid holding member therein and adaptedfor heating the liquid between the valve and the outer body section.

27. A syringe comprising inner and outer tubular body sections, saidouter section being movable longitudinally on the inner section, anozzle on the outer section, a valve normally closing one of saidtubular sections and having an operating part extending within the outersection for operation by said section upon moving it longitudinally onthe inner section in one direction, an electric heating element withinone of the body sections for heating the liquid, operating means movableon the inner body sectionfor moving the outer section thereon, and meansfor returning the outer section to normal position upon release of saidoperating means.

28. In a warm water syringe, a. body portion having a nozzle and apassage through said portion, a valve controlling the flow of waterthrough said passage, a source of warm water, a flexible tube ofrelatively small bore connecting said passage with said source, aheating element located in said body portion in proximity to saidpassage but without contact with the water therein for heating the watercontained in said passage and also for heating the water contained insaid tube as it flows through said passage to the nozzle pending thearrival of warm water from said source, and means for continuouslymaintaining the temperature of said heating element.

ALPHONSE F. PIEPER.

